If you have some kind of talk-to-text software, yes. I had a friend who crashed his motorcycle several years ago, broke both arms...he used...Dragon Speaking, I think it was called? A dictation software that would take his spoken words and turn them into text. (More details than that, I don't know...he lives in Korea, so it's not as though I was closely involved with any of the events. I only knew about it because he said, in some of his social media posts, that he was working with the software...)

Is it difficult to deal with things like italics and private messages? I love sending texts by talking already, and I've only been doing it for a day. Given that it is already difficult to type on the phone, even if you avoid those things it could worthwhile.

Dragon has mor functionality to be able to highlight text to apply codes to, but if you want to take the time to spell things out for Siri, it can work there, too. Honestly, I usually go without special formatting of posting from speech, or turn my phone sideways and use the shift-lock and arrow keys to highlight the sections I want to apply a formatting code to -- it's easier than trying to double-tap and then drag the sliders to cover the section.